1,800 research outputs found
Puffle-Pod Marine Evacuation System (POMES)
The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.Evacuation systems have always played a crucial part when designing a transport system. The cornerstone of these systems is to get people to safety in the quickest and safest way possible. When it comes to marine systems, the requirements greatly differ in comparison to those on land and in air. On a day with highly inclement and fierce weather, in the middle of the ocean, getting the crew to safety through a chute or a slide would expose the crew to ferocious danger. Thence, the proposed Puffle-Pod Evacuation System introduces a more protected and secure evacuation without putting the lives of the crew at high risk
Rapid prediction of NMR spectral properties with quantified uncertainty
open access articleAccurate calculation of specific spectral properties for NMR is an important step for molecular structure elucidation. Here we report the development of a novel machine learning technique for accurately predicting chemical shifts of both 1H and 13C nuclei which exceeds DFT-accessible accuracy for 13C and 1H for a subset of nuclei, while being orders of magnitude more performant. Our method produces estimates of uncertainty, allowing for robust and confident predictions, and suggests future avenues for improved performance
Stereo-Aware Extension of HOSE Codes
The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.Descriptions of molecular environments have many applications in chemoinformatics, including chemical shift prediction. Hierarchically ordered spherical environment (HOSE) codes are the most popular such descriptions. We developed a method to extend these with stereochemistry information. It enables distinguishing atoms which would be considered identical in traditional HOSE codes. The use of our method is demonstrated by chemical shift predictions for molecules in the nmrshiftdb2 database. We give a full specification and an implementation
Externalities in a Life-Cycle Model with Endogenous Survival
We study socially vs. individually optimal lifecycle allocations of consumption and health care, when individual health expenditure curbs own mortality but also has a spillover effect on other persons' survival. Such spillovers arise, for instance, when health care activity at aggregate level triggers improvements in treatment through learningbydoing (positive externality) or a deterioration in the quality of care through congestion (negative externality). We combine an agestructured optimal control model at population level with a conventional lifecycle model to derive the social and private value of life. We then examine how individual incentives deviate from social incentives and how they can be aligned by way of a transfer scheme. The agepatterns of socially and individually optimal health expenditure and the transfer rate are derived. Numerical analysis illustrates the workings of our model.Demand for health, externality, life-cycle-model, optimal control, tax-subsidy, value of life.
The reproductive value as part of the shadow price of population
The reproductive value (see Fisher [10]) arises as part of the shadow price of the population in a large class of age-structured optimal control models.life history, reproductive value
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Approximate analytical Solutions for the heat transfer in glass melting furnaces
Temperatures and convections in glass melts are governed by coupled partial differential equations. These equations can, in general, only be solved by numerical methods. Α considerable simplification of the partial differential equation for heat transport is possible under certain conditions. These conditions are frequently met in glass tanks. They allow the formulation of an ordinary differential equation for the heat transport with Solutions in the form of simple equations. These equations are analytical expressions of the vertical temperature profile in the glass melt. The Peclet number for the vertical flow component in the melt under the free surface appears to be the essential parameter in these expressions. It characterizes the combined heat transport by conduction and convection. However, flow velocity and thermal diffusivity vary strongly over the depth of the glass bath, thus rendering the Peclet number Position dependent. On this theoretical basis, it follows a detailed numerical and analytical study of the dependence of the vertical temperature profile on wall heat loss, primary recirculation and pull
The Reproductive Value as Part of the Shadow Price of Population
The reproductive value (see Fisher 1930) arises as part of the shadow price of the population in a large class of age-structured optimal control models.Reproductive value, distributed optimal control theory, McKendrick equation, shadow price, indirect effect.
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